Cutting torch



J. R. ROSE CUTTING TORCH Oct. 29, 1929.

Filed May 3, 1928 l@ Y e gru/manto@ mixed and by w Achamber a UNITED STATES JAMES BOSE, 0l? EDGEWORTH, PENNSYLVANIA CUTTING TORCH Application 1ed Hay 3, 1928. Serial No. 274,838.

This invention relates to so-called cutting torches or blow pipes used especially for cutting metals with oxygen and relates particularly to the heads and tips of such torches, these being the parts Where the gases are 'ch they are delivered to the work. y

The object of the invention is to provide an improved head construction of simple and cheap manufacture, and in which the parts can be readily assembled and adjusted to final or proper position.. 'The head includes an injector and a mixer, the function of the former being toinduce a flow of the combustible gas by means of the oxygen under a relatively high pressure the action of which entrains a roper amount or proportion of the combusti le gas, the gases then being delivered throu h a flared passage into a mixing djacent to the nipple or tip ofthe injector.

A further object of the invention is to mprove the tip construction whereby the inner and outer members thereof can be quickly and easily fitted together and the inner end of the inner member screwed into a threaded bore in the head, andwhereby the outer member may be readily attached to the head by means 0f a clamping nut, the outer member having a rib or shoulder whichts against a shoulder on the head where it is held by the nut 'referred to.l By removing the nut, both members of the tip can be readily removed or iin-'- screwed.

The inner member of the tip is characterized byV a polygonal cross sectlon, which enables it 1to fit within a correspondingly shaped bore orfinner cavity of the outer member, so

that the parts will slip together easily, the,

inner member having a series of grooves through which the pre-heating mixture passes to the outlet. The outer member is preferably' made relatively heavy, of some metal, such as copper which will conduct and radiate heat quickly andso will not readily burn out.

With these and other objects in view one form of the invention will b`e hereinafter described and is illustrated in the accompanying drawings, in which Fig. 1 is a side elevation' of the torch; Fig. 2 isa longitudinal section; Fig. 3 is a section on the line 3 -3 of Fig. 2; Fig. 'et is a rear elevation of the head; Fig. 5 is a side elevation of the inner member of the tip; Fig. 6 is a section on the line 6 6 of Fig. 2; and Fig. 7 is a section` on the line 7-7 ot Fig. 5. i

The head 6 consists of an angular casting having an offset exteriorly threaded projection7 to which the tip is attached. This head has a passage 8 for the cutting oxygen which may be supplied Ithereto through a pipe 9; also another angular port or' passage 10 through which oxygen may be supplied for pre-heating purposes, through a pipe 11; and

also an angular port or passage 12 through l which a combustible gas, such as acetylene, may be supplied through a pipe 13. The supply will be controlled by suitable valves common in this type of apparatus, and which are not shown. y

The lower part of the head (as it is ordinarily used) has a threaded bore 14 which receives a hollow plug 15 of special construction, this plug being inserted from the back, and having an angular head 16 whereby it may be screwed in or out. Near its outer end the plug has an annular depression 17 Which forms a chamber which communicates with the oxygen port 10, land in advance of this has an annular groove 18 which communicates with the combustible gas port 12.

The plug 15 has an axial threaded bore 18"l which receives a pin 19 provided with a head 20 having a kerf whereby it may be screwed in or out. The inner end of the pin is tapered as indicated at 21 and this tapered part or injector nozzle extends within an injector chamber 22 which communicates through a series of ports 23 with the groove 18. The pin also ,has a small axial bore 24 which communicates through a series of ports 25 with the chamber 17 to which oxygen is supplied. The forward end of the plug 15 has a Haring 0r expanding mixing passage` 26 opening from the chamber 22 and in axial alignment with the injector nozzle21, and which discharges into a cylindrical mixing chamber 27 coredI into the head 6 and its angular extenmember thus connects. The outer end of theVY `inner member and the bore therein are taered,the bore to a line or reduced outlet, as ndicated at 33. The outside of thev inner mnberls hexagonal or otherwise polygonal for most obivsclength, and each of the flat sides is provided vltlargrevet extending lengthwise from the mixing chamber 27 `to the outlet.

The outer member 'of the tip is also hollow,

and inclines or `tapers toward the outer end, and its interior is hexagonal or has flattened surfaces corresponding in shape to the outside of the inner member so the surfaces fit together closely, the grooves 34 thus forming discharge passages which converge near the outlet and so direct the pre-heating flames to a particular point. The inner end of the outer member fits snugly within the outer end of the chamber 27, and is provided with a rib 35 which abuts or seats against the outer end of the head projection 7 where it is clamped by means of a nut 36 having a flange 37 which seats against the outer side of the rib 35 and holds the nipple closely in position. The space within the flange of the nut may be filled with packing if desired. As stated, the outer member of the tip is preferably made relatively heavy and of metal such as copper which radiates heat readily and therefore will not burn out quickly.

In use, for pre-heating or welding, the combustible gas is admitted through the port 12 and the oxygen under relatively high press'ure, through the port 10, and the jet discharging through the nipple 21 has an injector action with respect to the gas in the chamber 22. and the gases are discharged through the flared mixing passage 26 into the mixing chamber 27 from which they escape through the grooves 34 and are ignited to effect the desired heat. For cutting, after a suitable pre-heating, the cutting oxygen is admitted through the passage 8 and flows through the bore 32 and out at the contracted nozzle 33 in a line jet to the point of application. j

It will be observed that the head may be readily fitted with the plug 15 and the injector pin 19, and these parts lcan be quickly removed for cleaning or replacement. Also that the members of the tip can be quickly assembled, and inserted or removed, and may be made of material suitable for the high temperatures employed, and different from the material of the rest of the device.

I claim:

1. A blow pipe `headv provided with a tip and plural supply and 'outlet passages, a

imber andfcommnnicagting with another of the supply passages.

2. A blow pipe head provided with a mixing chamber therein, and a tip having an outlet from said chamber, a plug fitting in the head, said plug havingsaniinjector chanrnherJ therein with a combustible gas inlet't/hereto,

said plug having a mixing outlet passage delivering into the mixing chamber, and an injector pin fitting axially into the outer end of the plug and having an injector nozzle projecting into the injector chamber and another gas inlet to said nozzle.

3. A blow pipe head having a mixing chamber therein and a tip extending from said chamber, a plug fitting in the head, said plug ,having therein a threaded bore terminating in an injector chamber and a mixing outlet passage delivering to the mixing chamber, and a screw pin in the outer end of said bore having an injector nozzle opening into said injector chamber, the plug also having an inlet port to the injector chamber for one gas and the pin having an inlet port to said nozzle for another gas.

4. A blow pipe tip having inner and outer members, the inner member having a tapered polygonal outer surface fitting against corresponding surfaces in the outer member, said outer surface having longitudinal' grooves therein. n

5. A blow pipe torch head having an angular extension with a mixing chamber therein, a bore extending from the rear end of the head inwardly to the side of said chamber, a plug in the bore having therein an injector chamber with a flared passage therefrom into said mixing chamber, an externally adjustable injector nozzle projecting axially from the outer end of the plug into said injector chamber, means to supply one gas to the inj ectorchamber, and means to supply another gas to the nozzle.

6. A blow pipe tip having inner and outer members, the inner member having a tapered polygonal outer surface fitting against corresponding surfaces in the outer member, causing the same to lock, said outer surface having longitudinal grooves therein.

7. IA blow pipe tip having inner and outer members, the inner member having a ta- 'V polygonal outer surface fitting against corresponding surfaces causing the same tolock, and having longitudinal A rooves therein, and tapered at the outlet en to cause a proper mpingement of the flame.

In testimony whereof, I alx my signature.

JAMES R. ROSE. 

